Bye-bye, crater

A piece of Mars: On Earth, it’s typically water that erodes a landscape, as rivers cut down rocks, storms trigger landslides, and ocean waves eat away at shorelines. On Mars, it’s usually the wind that slowly grinds down a landscape. Can you pick out the circle that once was an impact crater? (Image Credit: NASA/JPL/University of Arizona, HiRISE ESP_028911_1815)